Release new version of unittest. Seems we got a couple fixes and the version was

never updated. One important fix was that an extra 'stack' variable was
shadowing a parameter here:
  https://code.google.com/p/dart/source/detail?r=30322

R=jmesserly@google.com

Review URL: https://codereview.chromium.org//112253002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/unittest@31052 260f80e4-7a28-3924-810f-c04153c831b5

pubspec.yaml

 name: unittest
-version: 0.9.0
+version: 0.9.1
 author: Dart Team <misc@dartlang.org>
 description: A library for writing dart unit tests.
 homepage: http://www.dartlang.org